Prosecutors have concluded their investigation into an alleged sexual assault of a Seton Hall University softball player after investigators were unable to determine the identity of the alleged assailant, NJ.com learned on Monday.

The incident, which took place in the early hours of Nov. 16 at an off-campus fraternity party, was captured on cell phone video. But authorities said they couldn't track down the male seen in a white baseball cap and white T-shirt in the grainy 12-second clip.

"After a thorough investigation, we were unable to identify the person involved in the sexual assault," Essex County Prosecutor's Office spokesperson Katherine Carter told NJ.com.

In the video purported to be of the incident – caught on an Apple iPhone at 2:25 a.m. on Nov. 16, according to file data on the video obtained by NJ.com -- partiers can be heard shouting and laughing in the background as what is presumed to be the alleged assault occurs.

When the investigation was launched, sources told NJ.com that students at the party did not believe the male in the video was a Seton Hall student.

While no charges will be filed, there was some fallout for the softball players who attended the party where the incident took place.

There were at least four softball players suspended -- including the alleged victim – for violating
team rules, several people familiar with the investigation told NJ.com. Underaged drinking was the main factor in the bans, which varied from three to four games.

South Orange Police Chief James Chelel told NJ.com that the Essex County Prosecutor's Office hadn't notified him that the case had been dropped. Chelel said he would withhold comment until that occurs.

A message left with a Seton Hall spokesperson was not immediately returned.

Seton Hall officials warned students not to distribute the video, saying in a statement that “the recording or sharing of images of the alleged incident is completely unacceptable and contrary to Seton Hall’s Catholic mission and commitment to fostering an academic and social environment where all students are respected.”

The school said it conducted an internal investigation, but would not reveal the findings.